1、 IEC 61300-3-50 Edition 1.0 2013-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-50: Examinations and measurements Crosstalk for optical spatial switches Dispositifs dinterconnexion et composants p
2、assifs fibres optiques Procdures fondamentales dessais et de mesures Partie 3-50: Examens et mesures Diaphonie relative aux commutateurs spatiaux optiques IEC 61300-3-50:2013 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specifi
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16、ous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61300-3-50 Edition 1.0 2013-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part
17、3-50: Examinations and measurements Crosstalk for optical spatial switches Dispositifs dinterconnexion et composants passifs fibres optiques Procdures fondamentales dessais et de mesures Partie 3-50: Examens et mesures Diaphonie relative aux commutateurs spatiaux optiques INTERNATIONAL ELECTROTECHNI
18、CAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE M ICS 33.180.20 PRICE CODE CODE PRIX ISBN 978-2-83220-795-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publicat
19、ion from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 61300-3-50 IEC:2013 CONTENTS FOREWORD . 3 1 Scope . 5 2 Normative references . 5 3 General description 5 4 Apparatus . 6 4.1 Light source S . 6 4.2 Temporary joint T
20、J 7 4.3 Terminations T 7 4.4 Detector D . 7 5 Measurement procedure . 7 5.1 General . 7 5.2 Test set-up 7 5.3 Measurement of P 1. 8 5.4 Measurement of P 2. 8 5.5 Measurement of P i(i=3 to N) . 9 5.6 Measurement for other input ports . 9 6 Calculation . 9 6.1 Calculation of crosstalk for specified po
21、rt pairs 9 6.2 Calculation of total crosstalk for a specified output port . 10 6.3 Crosstalk of M x N fibre optic switch 10 6.4 Total crosstalk of M x N fibre optic switch 10 7 Details to be specified 10 7.1 Light source 10 7.2 Temporary joint . 11 7.3 Terminations . 11 7.4 Detector 11 7.5 DUT 11 7.
22、6 Others . 11 Bibliography 12 Figure 1 Crosstalk for N x 1 optical switch . 6 Figure 2 Measurement set-up of crosstalk for 1 x N optical switch . 6 Figure 3 Measurement setup of P 18 Figure 4 Measurement set-up of P 2. 9 61300-3-50 IEC:2013 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC I
23、NTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-50: Examinations and measurements Crosstalk for optical spatial switches FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national
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34、fying any or all such patent rights. International Standard IEC 61300-3-50 has been prepared by subcommittee 86B: Fibre optic interconnecting devices and passive components, of IEC technical committee 86: Fibre optics. The text of this standard is based on the following documents: FDIS Report on vot
35、ing 86B/3593/FDIS 86B/3622/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 61300-3-50 IEC:2013 A list of all parts in the IEC
36、 61300 series, published under the general title, Fibre optic interconnecting devices and passive components Basic test and measurement procedures can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated
37、 on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61300-3-50 IEC:2013 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND
38、 MEASUREMENT PROCEDURES Part 3-50: Examinations and measurements Crosstalk for optical spatial switches 1 Scope This part of IEC 61300 describes the procedure to measure the crosstalk of optical signals between the ports of a multiport M x N (M input ports and N output ports) fibre optic spatial swi
39、tch. The crosstalk is defined as the ratio of the optical power at an output port which comes from the unconnected input port, to the optical power at the output port which comes from the connected input port. 2 Normative references The following documents, in whole or in part, are normatively refer
40、enced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61300-1, Fibre optic interconnecting devices and passive components Ba
41、sic test and measurement procedures Part 1: General and guidance IEC 61300-3-2, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-2: Examinations and measurements Polarization dependent loss in a single-mode fibre optic device 3 General descripti
42、on The general meaning of crosstalk is the ratio of an undesired signal power to a desired signal power. The crosstalk of N x 1 (N input ports and one output port) fibre optic spatial switches is shown in Figure 1. For an N x M (N input ports and M output ports) fibre optic switch, the crosstalk is
43、the same as that for an N x 1 optical switch but expanded across M output ports. A fibre optic switch is basically bidirectional, i.e. a 1 x N (1 input port and N output ports) optical switches can operate as an N x 1 (N input ports and 1 output port) switch. The crosstalk for an N x 1 optical switc
44、h is measured as a 1 x N optical switch, as shown in Figure 2. When the input port for a 1 x N optical switch is connected to a light source, the crosstalk for a transmitting output port versus an isolated output port is the ratio of output power of these two output ports, expressed in decibels. Cro
45、sstalk is a negative value in dB. Do not use “isolation” in place of “crosstalk” as the two have a different values and meanings. The meaning of isolation is the optical loss for a port pair intended to block transmission, i.e. for which loss is nominally infinite. Isolation is a positive value in d
46、B. Crosstalk is a negative value in dB. NOTE 1 For WDM devices, crosstalk is defined as the value of the ratio between the optical power of the specified signal and all noise, as defined in IEC 62074-1 1 1 . The crosstalk for WDM devices is generally used as _ 1Numbers in square brackets refer to th
47、e Bibliography. 6 61300-3-50 IEC:2013 not simply “crosstalk”, but “some prefix” crosstalk, such as adjacent channel crosstalk, total crosstalk and so on. The measurement method of crosstalk for DWDM devices are described in IEC 61300-3-29 2. N 1 optical switch Port 1 (signal 1) Port 2 (signal 2) Por
48、t n (signal n) Common port (signal 1, and the sum of signals (2 n) as noise) IEC 959/13 Figure 1 Crosstalk for N x 1 optical switch 1 N optical switch Light source Port 1 (transmitting port) Port 2 (isolated port) Port n (isolated port) Optical detector 1 Optical detector n . . . IEC 960/13 Figure 2
49、 Measurement set-up of crosstalk for 1 x N optical switch For single mode fibre optic switches, the crosstalk may depend on the polarization state of the input light. A polarization state change system (PSCS; a polarization controller or a polarization scrambler) should be used with a light source. In this case, the crosstalk is generally defined as the maximum value of the measu
